Transport

Getting there and away: Get in
Spain is a member of the European Union and the Schengen Agreement, which governs its visa policies. No visa is required for citizens of other EU member states, and those of nations with whom the European Union has special treaties. There are no border controls between Spain and other Schengen Agreement nations, making travel less complicated.
As of May 2004 citizens of the following countries do not need a visa for entry into Spain. Note that citizens of these countries (except EU nationals) must not stay longer than three months in half a year and must not work in Spain: Andorra, Argentina, Australia, Austria, Belgium, Bermuda, Bolivia, Brazil, Brunei, Bulgaria, Canada, Chile, Costa Rica, Croatia, Cyprus, Czech Republic, Denmark, El Salvador, Estonia, Finland, France, Greece, Guatemala, Honduras, Hong Kong, Hungary, Iceland, Ireland, Israel, Italy, Japan, Latvia, Liechtenstein, Lithuania, Luxembourg, Macao, Malaysia, Malta, Mexico, Monaco, New Zealand, Nicaragua, Netherlands, Norway, Panama, Paraguay, Poland, Portugal, Romania, San Marino, Sweden, Switzerland, Singapore, Slovakia, Slovenia, Spain, South Korea, United Kingdom, United States, Uruguay, Vatican City and Venezuela.
There are a number of ways to get into Spain. From neighboring European countries, a drive with the car or a train ride are feasible; visitors from further away will probably be using air travel.(Wikitravel)

Hitchhiking: To get to cities like Madrid or Barcelona it should be fairly easy. But in general it is more difficult to hitch-hike there. It is possible to hitch-hike, but the freeways do not have as many reststops and you may find yourself let out in the middle of nowhere on some exit. Just expect a longer wait! The Spaniards are fairly reluctant to take hitchhikers, and many of your rides will probably be foreigners or truckers.

By bus: Bus travel in Spain is increasingly an attractive option for people travelling on a tight budget. Thanks largely to European Union funding, Spain's road network has vastly improved over the past twenty years, so bus journeys don't take nearly as long as they used to.
There are lots of private bus companies offering routes to all major Spanish cities. If you want to travel around Spain by bus, the best idea is to go to your local bus station (Apart from Madrid and Barcelona, most towns and cities have just one) and see what is available.
Travelling by bus in Spain is usually reliable (except on peak holiday days when roads can be very crowded and you should expect long delays on popular routes),coaches are modern and comfortable. You can expect to pay about 8 Euros per 100km. (Wikitravel)

By train: Train system in Spain is modern and reliable, most of the trains are brand new and the punctuality rate is one of the highest in Europe, the only problem is that not all the populated areas got a train station, sometimes small towns doesn't have one, in those cases you need to take a bus. Another issue with the Spanish Rail network is that the lines are disposed in a radial way so almost all the lines head to Madrid. That's why some times traveling from one city to another geographically close it might take longer by train than by bus if they are not in the same line. So check always whether the Bus or the train is more convenient.(Wikitravel)
RENFE - Timetables and Prices
FEVE - FEVE´s web page